Coal-based direct reduced iron shaft furnace

Abstract

The invention discloses a coal-based direct reduced iron shaft furnace and belongs to the technical field of coal-based direct reduced iron process equipment. The furnace body of the coal-based direct reduced iron shaft furnace is erected at a support steel structure, and the furnace body comprises a reduction cavity, burning cavities, and a discharge device; the reduction cavity is a rectangular structure cavity body composed of two parallel heat-conduction walls and the upper and lower parts of the reduction cavity are respectively provided with a sealed feed port and a sealed discharge port; the burning cavities provided with multiple layers of horizontal fire gas baffling channels are positioned at the both sides of the reduction cavity; and the discharge device is a spiral conveyer, the cylindrical shell of the spiral conveyer is of a jacket water cooling structure, and a spiral rotating shaft is a hollow water cooling structure. Compared with the tradition tubular reduction cavity body, the coal-based direct reduced iron shaft furnace provided by the invention has the advantages of high efficiency of heat transmission, and uniform heating of the inner and outer layers of a pelletized material in the furnace. The coal-based direct reduced iron shaft furnace can be used for effectively reducing the energy consumption of reduced iron and improving the merchantable quality and the production efficiency of a single furnace.

Description

technical field [0001] The invention relates to a shaft furnace, in particular to a coal-based direct reduced iron shaft furnace, belonging to the technical field of coal-based direct reduced iron process equipment. Background technique [0002] Compared with the gas-based direct reduction process, coal-based direct reduction refers to a process that directly uses coal as a reducing agent. In the existing shaft furnace technology of coal-based direct reduced iron process, the oxidized pellets are heated and reduced in the tubular reduction chamber in the furnace, and then directly discharged from the bottom of the furnace through the discharge device to the conveying equipment and sent for cooling , slag iron separation or sent to the smelting process for further processing. The existing coal-based direct reduction iron shaft furnace structure is large and short due to the reduction chamber, the heating area of ​​the oxidized pellets in the tubular chamber is small, the pel...

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Problems solved by technology

Due to the large and short reduction chamber of the existing coal-based direct reduction iron shaft furnace, the small heating area of ​​the oxidized pellets in the tubular chamber, the uneven heating of the pellets, and the short residence time of the high-temperature gas heating the reduction chamber, the coal-based The direct reduced iron process has high energy consumption and low production capacity. At the same time, the existing shaft furnace discharge device is likely to cause secondary oxidation of high-temperature reduced pellets in contact with air during production. The shortcomings of low material efficiency and low degree of automation cannot meet the production requirements of reduced iron

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